After rehearsal today I bundled Gatsby up and returned to the vet. To say that he's being surly is an understatement. He laid on the kitchen floor yesterday from morning until night, only moving when I brought his leash to him and carried him outside. He did his business and returned to his blanket. And mind yourself when you walk by, because rather than a tail-wagging happy Gatsby, you're going to get either growled at or nipped at, depending on the angle and how close to his "possessions" (read: blanket, my t-shirt, bone, food dish) you get.
The only thing worse than an only child is a sick only child.
The vet upped his meds and added a muscle relaxer, so hopefully he'll be more himself in a few days. In the meantime, I'm staying out of the kitchen.